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after deleting all cookies, verify deletion, restart, then cookies are back

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i delete all cookies. verify that there are no cookies left in firefox. shutdown, restart. it appears all the cookies have reappeared. how to really delete all cookies?

i delete all cookies. verify that there are no cookies left in firefox. shutdown, restart. it appears all the cookies have reappeared. how to really delete all cookies?

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Note that some extension create special opt-out cookies that you can't remove as long as the extension is installed.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window

If clearing cookies didn't help then it is possible that the cookies.sqlite file that stores the cookies got corrupted.

  • Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookies files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.

You can use this button to go to the currently used Firefox profile folder:

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Type about:preferences#privacy<enter> in the address bar.

Next to History, choose Use Custom Settings

Near the bottom, turn on Clear History When Firefox Closes Then to its far right, press the Settings button.